This is how RFK Jr tends to operate. By taking a statement with a grain of truth, he extrapolates a masterful inveigling.

I wouldn't put it past him to try to run as an independent. Even though many states have sore loser laws to prevent failed major party candidates from launching an independent bid, I imagine he could find a way to weasel around that. The other possibility that I see him pursuing is getting attached as a VP candidate to a Trump ticket. RFK Jr has already stated that he would be willing to accept a position in a Republican administration, and has been flattered by compliments from Trump.

His belief is using a free market approach on the environment.

Even if that were to be true, the only thing shown is that RFK Jr has no chance in the primary. Though, I am not convinced that is true when in 2012, an incarcerated inmate won 40% of the primary vote in WV against Obama. https://abcnews.go.com/blogs/politics/2012/05/prison-inmate-wins-more-than-40-of-democratic-vote-over-president-obama-in-wv-primary

It is interesting that you bring this up, because RFK Jr. likes to tout that he has a high favoribility rating. However, when that rating is broken down, that is being entirely driven by Republicans. His favoribility is dismal among Democrats.